Heads on bedstead-screws



H. N. SHERMAN.

Machine for Heading Bedstead Screws.

Patented Nov. 13, 1855.

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U TTE HTS H. N. SHERMAN, OF BIRMINGHAM, CONNECTICUT.

FORMING HEADS ON BEDSTEAD-SCREWS.

To all whom it may concern.-

Be it known that I, H. N. SHERMAN, of Birmingham, in the county of New Haven and State of Connecticut, have invented a new and Improved Machine for Forming Heads on Bedstead-Screws; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which,

Figure 1, is a plan or top view of my improvement. Fig. 2, is a transverse vertical section of ditto, 50, av, Fig. 1, showing the plane of section. Fig. 3, is an outer or face view of the dies which form the collar and head of the screws. Fig. at, is an inner View of one of the dies.

Similar letters of reference indicate corresponding parts in the several figures.

The nature of my invention consists in the employment or use of two dies attached to levers which are operated as will be presently shown and described, so that said dies have three movements, the first movement, to grasp the end of the rod, the second to upset or form the collar and partially form the square, and the third to complete the square.

My invention further consists in the combination of the two dies above mentioned and a movable head or stop arranged as will be presently shown and described.

To enable others skilled in the art to make and use my invention, I will proceed to describe it.

A, represents a bedplate supported by suitable legs or by a proper framing. At one side of the bed plate A, there is placed a shaft B, which has a fly wheel O, at one end. This shaft has four cams upon it, D, E, E, and F, all of which are shown in Fig. 1. On the bed plate A, there is placed a sliding plate G, which works between guides a, a, attached to the bed plate. To the plate G, there are attached by pivots or bolts 7), 6, two levers H, H, the bolts forming the fulcrums of the levers. To the inner sides of the levers H, at their front ends there are attached dies I, one to each lever. The form of these dies will be seen by referring to Fig. 4. The outer end of each die has a semi-circular concave 0, formed in it, the two concaves when the dies are in contact forming a circular recess or cavity, see Fig. 3, in which the collar of the square of the bolt, is formed, as will be hereafter shown. The other portions of the dies are formed each of a half square as shown clearly in Figs. 3 and A, the square, however, being of taper form near the outer edges of the dies, as shown in Fig. 4. Between the two levers H, H, there is placed a rod J, the front part of which slides in a bearing (l, attached to the sliding plate and the back part works through a pro-jec tion 6, attached to the back end of the plate G. The rod J, has a spiral spring f, around it, one end of which spring bears againstthe bearing (Z, and the opposite end bears against a pin 9, attached to the rod J. The spring f, keeps the rod J, back from the dies a suitable distance, the distance being regulated by a pin h, bearing against the projection e, or within a slot formed in its front end, see Fig. 2. The cam D, acts against the back end of the projection e, on the plate G, and a projection 2', attached to the periphery of the cam D, acts against the end of the rod J. The front end of the rod J, is of square form and works in the back part of the dies I, I, which are of square form having no taper, as shown clearly in Fig. 4.

On the bed plate A, and at each side of the levers H, H, there are attached by pivots or bolts j, levers K, K, the outer ends of which have friction rollers h, h, attached to.

them, one to each, see Fig. 1. These friction rollers bear against the outer ends of the levers H, H, and the inner ends of the levers bear against the cams, E, E, on the shaft B. The levers K, K, are connected by a spiral spring L, and the levers H, H, have a spring M, placed between them. The sliding plate G, is connected at its back end to a spring N. O, is a lever attached to the bed plate A, by a pivot or bolt Z. The inner end of this lever bears against the cam F, and the outer end has a link or shackle P, attached to it, said link or shackle being also attached to a sliding jaw Q, which works between suitable guides m, m, on the bed plate.

R, is a jaw attached permanently to the bed plate A, and in line with the sliding jaw Q. To the outer end of the jaw Q there is attached a cutter u, see Fig. 1.

Operation: The rod of which the bedstead screws are formed is properly heated and placed between the aws Q, R, the end of the rod bearing against the end of the rod J, which serves as a stop. Motion being given the shaft B, the jaw Q is moved toward the jaw R, and a piece of the rod of proper length to form a bedstead screw is cut off, by the cutter u, and firmly secured between the two aws Q, R. The levers H, H, are moved simultaneously with the jaw Q, and the dies I, I, are brought toward each other in consequence of the movement of the levers K, by the cams E, E, and grasp the end of the bolt, the narrow or smaller part of the dies at their inner ends coming in contact with it. The two levers H, H, are now moved toward the ends of the aws Q, R, in consequence of the prominent part of the cam D, acting against the end of the sliding plate G, and the collar 0 of the bedstead screw is formed in the concaves 0, 0, the inner side of the collar being pressed against the ends of the jaws the square p, is also partially formed in the dies I, I. The dies I, I, are now brought closely in cont-act in consequence of being forced between the friction rollers k, k, on the levers K, the ends of the levers H, H, being inclined and the rod J, is then forced by the projection 2', on the cam D, against the end of the square 7;, and the square 79, and collar 0, are completed and the head of the bedstead screw perfectly formed.

The above machine is extremely simple and operates well in practice.

I do not claim the jaws Q, R, neither do I claim the cams upon the shaft B, for operating the several levers, as shown, for they have been previously used for the same or for analogous purposes, but

What I do claim as new and desire to secure by Letters Patent, is,

1. Giving the levers H, H, to which the dies I, I, are attached, three separate or distinct movements in succession the first lateral movement causing the smaller parts of the dies at their inner ends to grasp the end of the rod, the second and sliding movement causing the collar 0, to be formed and the square p, partially formed, and the third lateral movement perfecting the square and completing the head, substantially as shown and described.

2. I further claim the combination of the dies I, I, when operated as shown, with the rod J, operated as described, the rod J, serving as a stop at the commencement of the operation, and also serving subsequently as a plunger to compress the metal forming the square 39, snugly within the dies I, I.

H. N. SHERMAN.

Witnesses:

EDMUND N. SHELTON, GEO. BLAKEMAN. 

